1212010021021 has 4 divisors (see below), whose sum is σ = 1213089283072. Its totient is φ = 1210930758972.

The previous prime is 1212010020973. The next prime is 1212010021031. The reversal of 1212010021021 is 1201200102121.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212010021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212010020992 and 1212010021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212010021031) 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, 539629341 + ... + 539631586.

It is an arithmetic number, because the mean of its divisors is an integer number (303272320768).

Almost surely, 2^{1212010021021} is an apocalyptic number.

It is an amenable number.

1212010021021 is a deficient number, since it is larger than the sum of its proper divisors (1079262051).

1212010021021 is a wasteful number, since it uses less digits than its factorization.

1212010021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079262050.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1212010021021 its reverse (1201200102121), we get a palindrome (2413210123142).

The spelling of 1212010021021 in words is "one trillion, two hundred twelve billion, ten million, twenty-one thousand, twenty-one".