1902020210121 has 16 divisors (see below), whose sum is σ = 2537127696384. Its totient is φ = 1267463228304.

The previous prime is 1902020210117. The next prime is 1902020210137. The reversal of 1902020210121 is 1210120202091.

It is not a de Polignac number, because 1902020210121 - 2² = 1902020210117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1902020210221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92739550 + ... + 92760056.

It is an arithmetic number, because the mean of its divisors is an integer number (158570481024).

Almost surely, 2^{1902020210121} is an apocalyptic number.

It is an amenable number.

1902020210121 is a deficient number, since it is larger than the sum of its proper divisors (635107486263).

1902020210121 is a wasteful number, since it uses less digits than its factorization.

1902020210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32420.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 1902020210121 in words is "one trillion, nine hundred two billion, twenty million, two hundred ten thousand, one hundred twenty-one".