1061001637921 has 4 divisors (see below), whose sum is σ = 1061016019200. Its totient is φ = 1060987256644.

The previous prime is 1061001637903. The next prime is 1061001637939. The reversal of 1061001637921 is 1297361001601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1061001637903) and next prime (1061001637939).

It is a cyclic number.

It is not a de Polignac number, because 1061001637921 - 2¹⁹ = 1061001113633 is a prime.

It is a super-2 number, since 2×1061001637921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061001637961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7079401 + ... + 7227718.

It is an arithmetic number, because the mean of its divisors is an integer number (265254004800).

Almost surely, 2^{1061001637921} is an apocalyptic number.

It is an amenable number.

1061001637921 is a deficient number, since it is larger than the sum of its proper divisors (14381279).

1061001637921 is an equidigital number, since it uses as much as digits as its factorization.

1061001637921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14381278.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 1061001637921 in words is "one trillion, sixty-one billion, one million, six hundred thirty-seven thousand, nine hundred twenty-one".