902121112021001 has 4 divisors (see below), whose sum is σ = 917411300360400. Its totient is φ = 886830923681604.

The previous prime is 902121112020899. The next prime is 902121112021007. The reversal of 902121112021001 is 100120211121209.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-902121112021001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (902121112021007) 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, 7645094169611 + ... + 7645094169728.

It is an arithmetic number, because the mean of its divisors is an integer number (229352825090100).

Almost surely, 2^{902121112021001} is an apocalyptic number.

It is an amenable number.

902121112021001 is a deficient number, since it is larger than the sum of its proper divisors (15290188339399).

902121112021001 is a wasteful number, since it uses less digits than its factorization.

902121112021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15290188339398.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 902121112021001 in words is "nine hundred two trillion, one hundred twenty-one billion, one hundred twelve million, twenty-one thousand, one".